<span>Cells that are in multicellular organisms are suited to do specific jobs and work together to help the organism stay alive. Single celled organisms have to perform all the actions themselves in order to stay alive. :) </span>
The term which describes any relationship in which two species live closely together is called SYMBIOSIS.
C. and the explanation is i just know
1. Multicellular
2. Multicellular, tissues, bilateral symmetry, body cavity, coelom, segmentation, jointed appendages, exoskeleton
3. Annelids
4.Jointed appendages, exoskeleton
5. Evolutionary phylogeny is unknown, but it is known to have some of these adaptive traits (multicellular, tissues, bilateral sym, body cavities, coelom)
6.sponges, jellyfish, roundworms, snails
